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British Journal of Anaesthesia, 2003, Vol. 91, No. 5 638-650
© 2003 The Board of Management and Trustees of the British Journal of Anaesthesia

Clinical Investigations

Optimization of desflurane administration in morbidly obese patients: a comparison with sevoflurane using an ‘inhalation bolus’ technique

L. E. C. De Baerdemaeker*,1, M. M. R. F. Struys1, S. Jacobs1, N. M. M. Den Blauwen1, G. R. P. J. Bossuyt1, P. Pattyn2 and E. P. Mortier1

Departments of 1 Anaesthesiaand 2 Surgery, Ghent University Hospital, De Pintelaan 185, B-9000, Gent, Belgium

Corresponding author. E-mail: luc.debaerdemaeker@UGent.be

Background. The concept of an ‘inhalation bolus’ can be used to optimize inhaled drug administration. We investigated the depth of anaesthesia, haemodynamic stability, and recovery time in morbidly obese patients resulting from bispectral indexTM (BISTM)-guided sevoflurane or desflurane administration and BIS-triggered inhalation boluses of sevoflurane or desflurane combined with titration of remifentanil.

Methods. Fifty morbidly obese patients undergoing laparoscopic gastroplasty received either BIS-guided sevoflurane or desflurane anaesthesia in combination with a remifentanil target-controlled infusion. Intraoperative haemodynamic stability and BIS control were measured. Immediate recovery was recorded.

Results. Intraoperatively, the BIS was between 40 and 60 for a greater percentage of time in the sevoflurane (78 (13)% of case time) than in the desflurane patients (64 (14)% of case time), owing to too profound anaesthesia in the desflurane patients at the start of the procedure. However, fewer episodes of hypotension were found in the desflurane group, without the occurrence of more hypertensive episodes. During immediate recovery, eye opening, extubation, airway maintenance, and orientation occurred sooner in the desflurane group.

Conclusions. Immediate recovery was significantly faster in the desflurane group. Overall hypnotic controllability measured by BIS was less accurate with desflurane. Overall haemodynamic controllability was better when using desflurane. Fewer episodes of hypotension were found in the desflurane group. The use of the inhalation bolus was found to be appropriate in both groups without causing severe haemodynamic side effects. Minimal BIS values were significantly lower after a desflurane bolus.

Br J Anaesth 2003; 91: 638–50


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